Icosahedron Inscribed in Octahedron

Theorem

An icosahedron inscribed in an octahedron involves the Golden Ratio.

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Proof

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Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1 \cdotp 83928 \, 67552 \, 1416 \ldots$

• 1998: John Sharp: Have You Seen This Number? (The Mathematical Gazette Vol. 82: pp. 203 – 214)  www.jstor.org/stable/3620403